2024-04-19 02:44 AM - edited 2024-04-19 08:29 AM
Hi,
I'm working on a hardware design using the STM32F765VIH and I am trying to connect a MT28EW128ABA1HPC-0SIT NOR Flash and IS66WVH16M8DBLL-100B1LI PSRAM to the FMC in muxed mode. I'm struggling to understand how the muxed connection should be made and although I've searched a lot I cannot seem to find any reference schematics for this.
Can anyone point me to reference material that could help me?
Thanks,
George
Edit: Corrected NOR Flash part number, was previously wrongly written as part IS29GL128-70DLEB
2024-04-19 06:04 AM - edited 2024-04-19 06:10 AM
What exactly do you mean by "muxed mode" here?
The PSRAM appears to be HyperBus interfaced; FMC does not support HyperBus. The 'F7 family does not have OCTOSPI interface which supports HyperBus, read AN5050.
JW
2024-04-19 08:14 AM - edited 2024-04-20 10:21 AM
Hello,
Not sure how do you plan to connect a HyperRAM to the FMC interface! The protocol is very different!
Regarding the NOR Flash, FMC muxed mode needs either a memory having natively a shared Address-Data lines (which is not the case of IS29GL128-70) or you need to add external latches to hold the address during the read/write operations.
2024-04-19 08:39 AM - edited 2024-04-19 08:39 AM
Sorry I had specified the wrong part number for the NOR Flash, I'm considering the MT28EW128ABA1HPC-0SIT but regardless of the actual partnumbers is there any reference design that shows how to interface the muxed FMC to standard parallel NOR Flash or PSRAM ?
2024-04-19 08:45 AM - edited 2024-04-19 09:00 AM
Hello,
MT28EW128ABA1HPC: same thing -> No muxed Address-Data busses:
Unfortunately (to my knowledge) there is no reference design provided by ST as all STM32 MCU boards are using memories having separated Address/Data lines: direct connections data-data, address-address (no shared busses / neither external latches).
2024-04-19 08:52 AM - edited 2024-04-19 08:53 AM
See this (same thread/different sites). It may give you some tips:
https://www.edaboard.com/threads/fmc-for-stm32-in-muxed-mode.399367/
https://community.st.com/t5/stm32-mcus-products/fmc-for-stm32-in-muxed-mode/td-p/216656